Signs of PeVatrons in Gamma-Ray Haze April 5, 2021• Physics 14, 41 A diffuse glow of high-energy gamma rays hints at the presence of powerful cosmic accelerators, called PeVatrons, within the disk of our Galaxy. Tibet AS m AS �� experiment detects high-energy gamma rays by observing showers of particles produced when the gamma rays hit molecules in Earth’s atmosphere. Tibet AS m AS �� experiment detects high-energy gamma rays by observing showers of particles produced when the gamma rays hit molecules in Earth’s atmosphere.× The interstellar medium is filled with relativistic charged particles—mostly protons and helium nuclei. Spaceborne telescopes and earthbound observatories have revealed that these cosmic rays can have energies exceeding